From: Peng Huang <shawn.p.huang@gmail.com>
Date: Sun, 2 Feb 2020 03:31:00 +0000 (-0500)
Subject: radeonsi: make si_fence_server_signal flush pipe without work
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=0660cbf4262891e6380faf0d99217b2d27873051;p=mesa.git

radeonsi: make si_fence_server_signal flush pipe without work

glSignalSemaphoreEXT sometime doesn't signal the semaphore, it is
because radeonsi doesn't flush if gl context doesn't have pending
work. Fix the porblem by always submit ib.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Cc: 19.3 20.0 <mesa-stable@lists.freedesktop.org>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3779>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3779>
---

diff --git a/src/gallium/drivers/radeonsi/si_fence.c b/src/gallium/drivers/radeonsi/si_fence.c
index e9dd3e937f2..26b5fc4bdba 100644
--- a/src/gallium/drivers/radeonsi/si_fence.c
+++ b/src/gallium/drivers/radeonsi/si_fence.c
@@ -606,7 +606,11 @@ static void si_fence_server_signal(struct pipe_context *ctx,
 	 * Therefore, we must make sure that we flush the pipe to avoid
 	 * new work being emitted and getting executed before the signal
 	 * operation.
+	 * 
+	 * Set sctx->initial_gfx_cs_size to force IB submission even if
+	 * it is empty.
 	 */
+	sctx->initial_gfx_cs_size = 0;
 	si_flush_from_st(ctx, NULL, PIPE_FLUSH_ASYNC);
 }